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Meteorological Conditions Associated With Long-Distance Dissemination and Deposition of Puccinia graminis tritici Uredospores in India. S. Nagarajan, Division of Mycology and Plant Pathology, Indian Agricultural Research Institute (IARI), New Delhi-110012; Hardev Singh(2), L. M. Joshi(3), and E. E. Saari(4). (2)Department of Botany, University of Delhi, New Delhi-110007; (3)Division of Mycology and Plant Pathology, IARI; (4)The Ford Foundation, Beirut, Lebanon. Phytopathology 66:198-203. Accepted for publication 21 August 1975. DOI: 10.1094/Phyto-66-198.

Long-distance spread of the airborne wheat stem rust uredospores depends on upper-air weather patterns. Trajectories of the airborne inoculum at the 700 millibar (mb) level led from the Nilgiris, the source area, to the secondary foci of infection. Drawings of the 700-mb trajectories were identical to the cloud system movement shown in the weather satellite imagery. Satellite imagery may be used to study uredospore transport and deposition. A schematic model is proposed for the spread and recurrence of stem rust of wheat in India.

Additional keywords: trajectories, Satellite Television Cloud Photograph (STCP), tropical cyclone.